12
TROUBLESHOOTING
OPERATIONAL SEQUENCE
GAS CONVECTION OVEN
1.)
Power switch turned on.
Power to oven
light switch
.
120 volts to rows A and B of 24 pin
terminal block
.
120/24 volt
transformer
energized.
24 volts to rows C and D of 24 pin
terminal block
.
24 volts to center connector of
Back-up toggle switch
.
24 volts to pin A on
Back-up relay
coil.
24 volts to connectors 6 and GR on
spark module
.
2.)
Spark module begins sparking at pilot burner
24 volts to pilot valve coil of
combination gas valve
(Grn #33 (which jumps to main valve coil) and
Blu # 32).
Pilot valve opens.
Gas flows to
pilot burner
.
Pilot burner lights.
3.)
Pilot light confirmed by spark module
12 to 13 micro amps on pin 4 of
spark module
24 volts from pin 3 (Brn # 34A) on s
park module
to center connector of
Back-up toggle switch
.
4a). Back-up toggle switch Off
Circuit 1
24 volts to line terminal of
control panel
.
24 volts from switch panel (Blu # 13) through door switch to
motor contactor
coil.
Motor contactor closes, door switch closed, motor starts.
Motor centrifugal switch closes ( for heat circuit).
Circuit 2
24 volts to terminal B on
Back-up relay
.
Back-up relay closes, energizing
120/12 volt transformer
.
12 volts to top connector on
microprocessor
.
Computer starts.
Product selected on
Control Panel
.
24 volts from Control Panel (Red # 26) through safety thermostat, through motor centrifugal
switch, to main valve coil of
gas combination valve
.
Main valve opens.
Gas flows to
main burners
.
Main burners light.
